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Typical gas / oil system with A/C.         

A jumper wire between Rc and Rh is 
provided. There is no need to install 
a jumper.

Wiring diagram for a typical oil burner, 
hydronic zone / Air handler with A/C. 
Cut the Rc / Rh link on the UZC4 
Panel for systems requiring isolation.

Single
Transformer
Gas/Oil Systems 
1 or 2 Stage Heat

Two 
Transformer
Oil/ Hydro 
Systems

Figure 14.  Single transformer Gas / A/C system. 

Figure 16.  Conventional Heat Pump System

Figure 15.  Two transformer Oil or Hydronic / A/C system.

Dual Fuel
Heat Pump
with “O” Type 
Reversing Valve

HVAC SYSTEM WIRING

Figure 17.  Single stage heat pump and single stage furnace.

Note that a Conventional & Dual fuel heat pump could wire up more or less the 
same. The difference is how staged heat operates. In a Conventional system, 
the indoor fan & the compressor continues to run when stage up occurs. In a 
Dual Fuel system, the indoor fan & the compressor shuts down when stage up 
occurs. The UZC4 will perform these functions automatically. All you have to 
do is set the dip switches to the correct settings. Select DF or CONV at dip 
switch #2, Bank 1. Choose to activate 2nd stage heat by TIMER or by 
OUTSIDE AIR TEMPERATURE. (Optional Sensor Required) 

You can also 

use Multi-stage thermostats in any or all Zones. 

When the thermostat stage up 

heat demand is satisfied, the UZC4 will stage down, unless DF/OAS has been 
selected and the outdoor temperature is lower than the OAS changeover 
setting. In that case the system will continue in FUEL mode, until all heating 
demands are fully satisfied. 

Your Heat Pump may be capable of making 

these decisions without the aid of the UZC4, in which case you may elect 
to wire your system as shown in figure 17.

UZC4

Oil / Wood Burner 

Primary Control

or

Boiler Control

or

Zone Valve

or

Pump Control

Terminals

Y
C

R

Y

G

C

TYPICAL FAN

CENTER

TERMINAL

BLOCK

OUTDOOR

CONDENSING

UNIT

*W

W*

RC/RH
LINK

RC/RH
LINK

Cut Rc/Rh
  Jumper

Cut Rc/Rh
  Jumper

* 

Note: 

Your Air Handler may include a W terminal. That 

means it may have it’s own isolation circuit. If you can 
confirm this, simply connect the W1 terminal to the W 
terminal on the air handler. Do not cut the Rc / Rh jumper. 
Wire up your Oil Burner, Pump Control, or Hydronic Zone 
valve to the isolation terminals or wires provided in the air 
handler. (follow dashed lines)The fan is controlled via 
time delay relay inside the air handler, or set the UZC4 
“FAN “ Dip Switch to the “HYDRO” position.

T

T

Hi Efficiency Heat Pump with built-in Outside 
Air Changeover Capability. The Heat Pump 
makes the decision to run the Furnace. Note 
that the UZC4 can still operate the furnace in 
Emergency Mode! 

GAS/OIL

Furnace

1or2 STAGE

Y
C

OUTDOOR

CONDENSING

UNIT

Y2

G

Y1

W2

C

R

W1

EWC Controls Inc.   385 Highway 33    Englishtown, NJ 07726   800-446-3110   FAX 732-446-5362      E-Mail- [email protected]

12

T

T

 IS

OLATION TERMINALS 

           OR WIRES

W2

W1

RH

RC

Y2

O

Y1

G

RC/RH
LINK

RC/RH
LINK

B

E

H
V
A
C
-
S
Y
S
T
E
M

W2

W1

RH

RC

Y2

O

Y1

G

B

E

H
V
A
C
-
S
Y
S
T
E
M

UZC4

*

*

GAS OR OIL

FORCED AIR

FURNACE 

BACKUP HEAT

HEAT PUMP

1 STAGE

Wout

O

Y

C

R

UZC4

W2

W1

RH

RC

Y2

O

Y1

G

RC/RH
LINK

RC/RH
LINK

B

E

H
V
A
C
-
S
Y
S
T
E
M

W

Y

G

C

R

Typical heat pump system wiring with 
electric resistance backup heat. Wire 
up the reversing valve to either O or B, 
depending on your system type.  
Applies to air cooled or geothermal / 
ground source systems.

Conventional 4
Stage Heat Pump
with a “B” Type
Reversing Valve

AIR HANDLER

WITH 1 0R 2 STAGE

ELECTRIC RESISTANCE 

BACKUP HEAT

HEAT PUMP

2 STAGE

X / W

B

Y

C

R

UZC4

W2

W1

RH

RC

Y2

O

Y1

G

RC/RH
LINK

RC/RH
LINK

B

E

H
V
A
C
-
S
Y
S
T
E
M

W

Y

G

C

R

*

W2

O

B

Y2

Y2

Diagram reflects a Heat Pump with a “B” type 
Reversing Valve 

NOT

 a neutral or Common 

terminal designated as “B”.

W

Содержание Ultra-Zone UZC4

Страница 1: ...ool Changeover Status LED System LEDs Damper LEDs Operating Power Manual and Automatic Thermal Circuit Breakers Operating Conditions Indoor Fan Control Model UZC4 Zone Control TB 221 Box Contents UZC4 Zone Control Panel Supply Air Sensor Technical Bulletin TB221 Mounting Hardware Leave this bulletin on the job site for future reference EWC Controls Inc 385 Highway 33 Englishtown NJ 07726 800 446 3...

Страница 2: ...he SYSTEM RESET button for 5 seconds That will reset the Main Expansion modules on a UZC4 Zoning System NOTE A three minute startup delay occurs whenever the CPU Reset button is pushed upon any initial power up or when a power failure has occurred Timer Reset BUTTON CPU Reset BUTTON Emergency Heat Switch Supply Return Air Limit Delay Timer 3 minutes Fixed Opposite Mode Delay Timer A 20 minute dela...

Страница 3: ...Alarm Interlock feature will over ride the CO2 Monitor feature AUXILARY or DeHUMIDIFY INTERFACE RELAY Enhanced Comfort Solution Auxiliary dry SPDT output This feature is affected by Heat Cool Operations Fire Alarm Activation Over rides this feature The UZC4 includes an Auxiliary Interface Input and SPDT action Dry Contact Output This allows the Installer to connect various Auxiliary controls such ...

Страница 4: ...set points If the Return Air temperature is 80 degree F or below Stage Up is allowed 105 degree F or above Stage Down is forced Default 10 set points If the Return Air temperature is 90 degree F or below Stage Up is allowed 115 degree F or above Stage Down is forced RETURN AIR LIMITS DURING HEATING CYCLES FOR GAS OIL STRAIGHT ELECTRIC Default 0 set points If the Return Air temperature is 80 degree...

Страница 5: ...tem being controlled the type of thermostats connected and the programmed staging sequence you desire As always you can still control a multi stage HVAC system using inexpensive single stage thermostats and sequence the staging by on board adjustable time delay or by using an optional outdoor air sensor OAS and sequence the staging via an outdoor air set point You can still control a state of the ...

Страница 6: ...s to the correct and or desired positions will result in improper operation of the controlled HVAC System Please read and study the entire Technical Bulletin and if necessary Call the EWC Technical Support Hotline when assistance is required Leave this Technical Bulletin with the Home or Building Owner for future reference 6 EWC Controls Inc 385 Highway 33 Englishtown NJ 07726 800 446 3110 FAX 732...

Страница 7: ... always over ride the Timer or OAS staging operations Unless the 50 rule has been enabled or the Return Air temperature limit has been exceeded NOTE4 Thermostatic demands to Stage Down will be honored unless the Timer is also in use NOTE5 Disable the Timer by setting to OFF and the UZC4 will obey Stage up Stage down demands via the thermostats only OAS STAGES TMR OFF 50 RULE ON Select OFF if you d...

Страница 8: ...mber of zones rounded up must be calling for the same mode of operation or the UZC4 will not activate the HVAC system This feature only activates at 8 or more zones Select OFF if you do not want to utilize the Zone Demand Limiter feature NOTE Zone 1 is not affected by this feature Zone 1 demands are always honored ZDL example A zone system has 20 total zones and the ZDL feature is active At least ...

Страница 9: ...ring Supply All of the preceding diagrams reflect conventional Non Heat Pump thermostats controlling conventional HVAC systems However the equipment being controlled does not have to be the conventional type A heat pump system can be controlled using conventional thermostats Figure 5 Figure 4 Model EWT 725 Configured for typical 2 stage Gas or Electric heating system with 1 stage cooling C W2 Y2 R...

Страница 10: ... Thermostat instructions for further details Model EWT 955WH Wireless Thermostat Configured for 3 heat 2 cool heat pump See thermostat instructions for further details Model EWT 855i Configured for 3 heat 2 cool See thermostat instructions for further details Model EWT 725 Configured for 2 heat 1 cool heat pump See thermostat instructions for further details Field installed jumper Field installed ...

Страница 11: ...TAT W1 E Y2 AUX R CO2 CO2 Wiring for typical 3 stage Heat 2 stage cool Heat Pump Diagram reflects De humidification terminal wired to the Auxilary input For auxilary output wiring see page 14 Auxilary Relay Dip Switch 5 Bank 2 should be set to Reverse Acting RA Refer to Dehumidify Operations on page 14 Wiring a split circuit thermostat to operate a Radiant floor heating or Baseboard heating Hydron...

Страница 12: ...ontrol or Zone Valve or Pump Control Terminals Y C R Y G C TYPICAL FAN CENTER TERMINAL BLOCK OUTDOOR CONDENSING UNIT W W RC RH LINK RC RH LINK Cut Rc Rh Jumper Cut Rc Rh Jumper Note Your Air Handler may include a W terminal That means it may have it s own isolation circuit If you can confirm this simply connect the W1 terminal to the W terminal on the air handler Do not cut the Rc Rh jumper Wire u...

Страница 13: ...efer to Mfr s data for specific equipment dip switch settings and logical program settings Set up the UZC4 to control the staging based on Time with single stage Conventional Thermostats Or you can install 3 stage Heat Pump Thermostats on all zones High Efficiency Heat Pump 3 or 4 Stage Heat and 2 Stage Cool Warning All of the wiring diagrams provided are general in nature and may not perfectly ma...

Страница 14: ...control calls for Dehumidification the UZC4 will activate Y1 G and the Auxiliary Relay to signal the Air Handler to slow the fan down The UZC4 WILL ALSO e n e r g i z e t h e E Emergency output terminal to REHEAT the cold discharge air and Rapidly Dehumidify the home Energizing the E during this cycle prevents over cooling the home A common Customer complaint with the DeHumidify cycle in these HVA...

Страница 15: ...trol the fan speed on most any variable speed air handlers or furnaces during cooling operations The UZC4 will lower the fan speed when 25 or less of the total zones are calling for cooling When this occurs the UZC4 will activate the Auxiliary relay output which will de energize the DS BK terminal on the Forced air unit resulting in the blower running at a lower speed NOTE 1 A jumper is required a...

Страница 16: ...uxiliary Feature can be used to control Humidify Operations on any HVAC System Set the Auxiliary relay Dip Switch to Direct Acting and connect a dry contact Humidity Control to the R and AUX R terminals When the UZC4 detects a demand to Humidify it w i l l e n e r g i z e t h e Auxiliary Output Relay The Auxiliary relay contacts are dry so you can connect and control most any humidifier you want T...

Страница 17: ... UZC4 to a separate CO2 Monitor with auxilary dry contacts as shown Also install and wire up a fresh air damper as shown Set the PPM trip threshold on the CO2 Monitor per the Mfr s Instructions or local requirements Upon activation the UZC4 will open the Fresh Air Damper and Start the Indoor Fan if it is not already running The UZC4 will continue the ventilation process until the CO2 Monitor reset...

Страница 18: ... will shutdown the controlled HVAC system and force all connected dampers to t h e c l o s e d p o s i t i o n s effectively isolating the duct work and the Fan system This action will reduce the spread of smoke advancing through the building assisted by Fan and Duct systems that are not interlocked with a Fire Alarm system or equipped with the capability to do so The UZC4 has a set of dedicated t...

Страница 19: ...SE DIAGRAMS PRIOR TO INSTALLATION AND POWER WIRING DOING SO WILL SAVE TIMEAND LABOR ON THE JOB SITE Patented Optical Damper Motor Actuators Figure 31 Figure 33 Figure 34 All Models SMDL BMDL Damper Wiring 2 4 1 M1 M2 M4 M6 All Models MA ND MA URD Damper Wiring 4 6 1 Patented Optical Damper Motor Actuators Figure 32 M1 M2 M4 M6 On all these dampers and most older style dampers including competitor ...

Страница 20: ...block and allows a maximum 60va transformer to be connected This means that you can directly connect a theoretical maximum of 12 Genuine ND URD dampers to a single 2 zone expansion module Now you no longer have to isolate power up multiple dampers using field installed relays The Expansion modules provide the isolation for you See the diagram below for typical wiring solutions for dampers Separate...

Страница 21: ... R8 D14 D13 D12 D11 R15 R12 R13 R14 D16 D15 R17 R16 R18 R63 R55 R53 R52 R54 R61 R60 Z1 R56 R57 R19 C2 C54 D2 R20 R21 R22 A U X R L Y C25 C26 C27 R65 R66 R67 R68 R71 R70 R69 R72 R73 R28 R27 R26 R25 R24 R23 D17 D18 D19 D20 D21 D22 R64 C48 C47 C46 C51 C50 C49 C52 SW3 R134 R128 R129 R130 R130 R132 R133 R135 R127 R126 R125 R124 R123 R122 U17 U18 U19 C42 C41 C40 C45 C44 C43 R121 R120 R119 R118 R117 R116...

Страница 22: ...EN LED will illuminate solid to indicate that the Outside Air damper is energized open in response to the CO2 detector or other device to provide demand based ventilation BYPASS DMPR The BYPASS DMPR LED will illuminate solid to indicate that the Bypass damper s is being forced to the Open position Occurs during idle short cycle and changeover periods AUX RELAY The AUX RELAY LED will illuminate sol...

Страница 23: ...Damper Motor Power Input Block The ZXM2 Expansion Module is powered via the Bus Cable from the UZC4 but the power for the dampers must be provided by a separate transformer and is isolated from the module This allows great freedom to connect as many dampers as the 2 5 amp thermal breaker can handle See page 19 for damper motor power supply details Make sure to read the ZXM2 Technical Bulletin for ...

Страница 24: ... on the UZC4 and other ULTRA ZONE products When calling for Technical Support please have a multi meter pocket screwdriver and wire cutter stripper handy TECHNICAL SUPPORT LED s do not illuminate and HVAC system does not respond LED s are not responding properly and HVAC system is malfunctioning LED S are responding properly but HVAC system is malfunctioning SYMPTOM Disconnect the wire s from the ...

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